/*******************************************************************************
 * Licensed to the OKChem
 *
 * http://www.okchem.com
 *
 *******************************************************************************/
package com.lz.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;

/**
 * Created by toy lv on 2018/1/11 0011.
 *
 * @author:toy lv
 * @DATE:2018/1/11 0011
 */
@Component
public class RedisLock {

    @Autowired
    private StringRedisTemplate redisTemplate;

    public boolean lock(String key, String value) {
        if (redisTemplate.opsForValue().setIfAbsent(key, value)) {
            return true;
        }
        //currentValue value A,另外两个线程 value值相同是B
        String currentValue = redisTemplate.opsForValue().get(key);
        if (!StringUtils.isEmpty(currentValue) && Long.parseLong(currentValue) < System.currentTimeMillis()) {
            String oldValue = redisTemplate.opsForValue().getAndSet(key, value);
            if (!StringUtils.isEmpty(oldValue) && oldValue.equals(currentValue)) {
                return true;
            }
        }
        return false;
    }

    public void unlock(String key,String value){

        String currentValue=redisTemplate.opsForValue().get(key);
        if(!StringUtils.isEmpty(currentValue)&&currentValue.equals(value)){
            redisTemplate.opsForValue().getOperations().delete(key);
        }

    }
}
